My theory here is that injuries would prevent this from happening.
Plus it would make all the leagues competitive, regardless of player variance.
Rookies in the minors would have time to put points into their durability to ensure that they will be able to take the big hits in the SHL.

The only problem with injuries is that they can take away from the fun of playing in a sim (You cant play if you are hurt, duh)
But we could probably find a work around to this, to either allow the play to heal through their injury faster through some sort of forum participation, or we can give them a TPE bonus as compensation for time lost.